[=;216624]
bugs/crashes -> on answerhub
-dicussion stuff -> forum
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answerhub is good for discussion too, as long is based from a question, it was made for handeling Q&A format rether then bug/crash raporting. On stack overflow (which use same system) disscussion is normal thing, for example ever hot topic on UE4 forums know as C++ vs C# can be find there too: ://stackoverflow/questions/4257659/c-sharp-versus-c-performance . But considering UE4 community is set for discussion of forums i understand what you mean by that, but i would not limit answerhub to bug and crashes… in fact those kind of questions are the once that are answered rarely on answerhub. Besides isn’t public bug tracker in plans for that? 
[=;216624]
-dont post too long descriptions
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One of problem i see on AnwserHub is that people don’t explain much of there problem (Most annoying once that user saying he has a “error” but not saying what error the getting :p), the more problem is described then it’s better and less need of comment quastions, so i would rether encourage to make long descriptions of a problem.
So any question is good for AnwserHub, i think the main factor is the more general question is (for example when it requires to write whole tutorial… which sometimes i actually do if i’m in the mood :p) and less described the less chance it will answered quickly, aspecially from Epic as they usually busy.